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耳蜗结构对低频信号频散特性的影响

李特 刘少宝 李蒙萌 吴莹 李跃明

李特, 刘少宝, 李蒙萌, 吴莹, 李跃明. 耳蜗结构对低频信号频散特性的影响[J]. 应用数学和力学, 2014, 35(8): 893-902. doi: 10.3879/j.issn.1000-0887.2014.08.007
引用本文: 李特, 刘少宝, 李蒙萌, 吴莹, 李跃明. 耳蜗结构对低频信号频散特性的影响[J]. 应用数学和力学, 2014, 35(8): 893-902. doi: 10.3879/j.issn.1000-0887.2014.08.007
LI Te, LIU Shao-bao, LI Meng-meng, WU Ying, LI Yue-ming. Influences of the Cochlear Structure on the Dispersion of Low-Frequency Signals[J]. Applied Mathematics and Mechanics, 2014, 35(8): 893-902. doi: 10.3879/j.issn.1000-0887.2014.08.007
Citation: LI Te, LIU Shao-bao, LI Meng-meng, WU Ying, LI Yue-ming. Influences of the Cochlear Structure on the Dispersion of Low-Frequency Signals[J]. Applied Mathematics and Mechanics, 2014, 35(8): 893-902. doi: 10.3879/j.issn.1000-0887.2014.08.007

耳蜗结构对低频信号频散特性的影响

doi: 10.3879/j.issn.1000-0887.2014.08.007
基金项目: 国家自然科学基金(11272242;91016008)
详细信息
    作者简介:

    李特(1991—),男,湖北人,硕士生(E-mail: liter356@163.com);吴莹(1967—),女,安徽人,教授,博士生导师(通讯作者. E-mail: wying36@163.com).

  • 中图分类号: R318.08

Influences of the Cochlear Structure on the Dispersion of Low-Frequency Signals

Funds: The National Natural Science Foundation of China(11272242;91016008)
  • 摘要: 耳蜗是人体最为精密的力学元器件,能处理频率从几十到几万赫兹的声信号.实验研究表明,声波进入耳蜗后,沿着基底膜传播,基底膜能够将不同频率的声信号分散到不同的位置,并为位于基底膜上的毛细胞所感知,就像一个天然的Fourier(傅里叶)滤波器.在von Békésy行波理论框架体系下,基于Manoussaki等人的三维螺旋基底膜流固耦合耳蜗模型,考虑耳蜗导管高度和基底膜刚度均为纵向梯度变化,推导出基底膜声波传播的频散方程,分别分析了基底膜刚度和耳蜗导管高度对频散特性的影响.发现耳蜗内淋巴液的存在大大提高了耳蜗对低频信号的处理能力,且捕获频率随基底膜刚度和耳蜗导管高度的减小而降低,两者梯度变化在声信号调制中起协同作用.最后,以人、沙鼠和豚鼠的具体耳蜗参数为例,得到3种生物耳蜗频率-点位图,并验证了低频段模型预测的正确性,比较分析了耳蜗频散功能与生物适应性之间的关系.
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出版历程
  • 收稿日期:  2013-11-19
  • 刊出日期:  2014-08-15

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